Much later, after the Liberation of Bulgaria in 1878, all of Northern Bulgaria and the region of Sofia became the Principality of Bulgaria while most of the rest of Southern Bulgaria was part of Eastern Rumelia until the Bulgarian unification in 1885.
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Albanian settlement in northern Bulgaria was not limited to Catholics—in a 1595 letter to the Prince of Transylvania, Ragusan merchant Pavel Đorđić notes that "in Bulgaria there are many villages inhabited by Albanians, from where 7,000 brave and well-trained men can be rallied".
There are two "Chernozem belts" in the world: from eastern Croatia (Slavonia), along the Danube (northern Serbia, northern Bulgaria (Danubian Plain) and southern Romania (Wallachian Plain)), to northeast Ukraine across the Black Earth Region and southern Russia into Siberia, and the other in the Canadian Prairies.
During the fourth century, the Goths were converted to Christianity, largely through the efforts of Bishop Wulfila, who invented the Gothic alphabet and translated the Bible into the Gothic language in Nicopolis ad Istrum in today's northern Bulgaria.
The Paulician dialect is spoken by some 40,000 people, nearly all of them Catholic Bulgarians, in the region of Rakovski in southern Bulgaria and Svishtov in northern Bulgaria.
After adoption of the decisions of Berlin Congress on 1 July 1878 the Sanjak of Sofia was merged with Northern Bulgaria into Principality of Bulgaria, a de facto independent vassal of the Ottoman Empire.